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<blockquote data-quote="fox_forma" data-source="post: 1545631" data-attributes="member: 565847"><p>i have had both downfiring and upfiring in my 03 Silverado ex cab and there really wasnt much of a difference.&nbsp; However if you do a downfire you are most likely going to have to dynomat the whole floor in the rear.&nbsp; The main reason i got rid of my downfire was because it shook everything underneath the truck and it was very annoying.&nbsp; An upfire worked out just as well with less vibrations under the truck plus i thought it looked nicer.&nbsp; Also I would just FG the whole floor of the box instead of just the center hump, it will take a lil longer and cost a few extra but it will make sure it sits perfectly in there.&nbsp; Just build the outside frame, sit it in and lay the glass, you will also be able to get a little more airspace out of it as well.&nbsp; Have you looked at fullsizechevy.com or gmfullsize.com?&nbsp; There are several set-ups in there that have how-to&#039;s and you can get a better idea of what you really want.&nbsp; Hope i could shed a little light for ya</p></blockquote><p></p>

[QUOTE="fox_forma, post: 1545631, member: 565847"] i have had both downfiring and upfiring in my 03 Silverado ex cab and there really wasnt much of a difference. However if you do a downfire you are most likely going to have to dynomat the whole floor in the rear. The main reason i got rid of my downfire was because it shook everything underneath the truck and it was very annoying. An upfire worked out just as well with less vibrations under the truck plus i thought it looked nicer. Also I would just FG the whole floor of the box instead of just the center hump, it will take a lil longer and cost a few extra but it will make sure it sits perfectly in there. Just build the outside frame, sit it in and lay the glass, you will also be able to get a little more airspace out of it as well. Have you looked at fullsizechevy.com or gmfullsize.com? There are several set-ups in there that have how-to's and you can get a better idea of what you really want. Hope i could shed a little light for ya [/QUOTE]

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